Microgeographic variation of HLA-A, -B, and -DR haplotype frequencies in Tuscany, Italy: implications for recruitment of bone marrow donors. - Marroni, F.; Curcio, M.; Fornaciari, S.; Lapi, S.; Mariotti, M. L.; Scatena, F.; Presciuttini, S. (Tissue Antigens, 2004)